Skip to main content

Full text of "Metallurgy Of Cast Iron"

See other formats


CHAPTKR   LXXI.
5\V PROCESS FOR GRAZING CAST IRON.
.0 the ' American Machinist" of March 14, ioor, an
tonal appears on this subject in which it says: 4i If .* reports of the extreme ease with which this pro-is is applied and of its successful results arc well mded, its diseovery marks an important epoch in tal working. It was invented by an engineer named eeh, and has been thoroughly tested at the Meehan-,1 Technical Testing Institute a! Charlottenbur^', ;ir Berlin. Professor Martens, of this institute, testi-s that the iron thus bra/ed stands the strain like \v and has not deteriorated under the process. The ;eovery has already been applied by 'i number of uninent engineering firms in (ireat Britain. i*This method of bra/Jiij^ i.s. explained as follows: !T tin* surfaces hav* bre-n cleaned, they arc treated t!i a moistened mixture of * fcrroijx ' (which is the "in applied by the inventor t a metallic oxide, pref-ibly of t'o|>pi*r) and a, tlux such as borax, soluble iss% or, bettt*r, * borifix/ a mixture recently invented d patented by the same inventor. The surfaces are 11 covered with borax or hnriiix, then with strong Idrr such as i^ used fr wrought iron, and then tin* Ut! is brought to a red heat. A chemical decoiupo-ih fakes place in U'hich th<- oxygen of the metallic idc euinhines with the carbon of the iron to formdopted by the A. F. A. Convention at Buffalo, June, 1901.      The                 !